APA (7e ed.) Bronvermelding

Gill, R. T. (1978). Economics: A text with readings (3d ed.). Goodyear Pub. Co..

Chicago (17e ed.) Bronvermelding

Gill, Richard T. Economics: A Text with Readings. 3d ed. Santa Monica, Calif.: Goodyear Pub. Co., 1978.

MLA (8e ed.) Bronvermelding

Gill, Richard T. Economics: A Text with Readings. 3d ed. Goodyear Pub. Co., 1978.